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Old 24th August 2009, 09:57 AM   #1
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Default High efficiency 12 inch midrange - recommendations?

Hi,

I am about to buy a 12" midrange driver to play the 150 to 800 hz band and it will hand over upper midrange to a Coral M100 unit mounted on a 400 hz tractrix horn. I'm looking for 100 db plus at no more than -3 db at 150 hz in a reasonably sized baffle.

My favorite at the moment is the 18Sound 12NMB420, but are there any good 12 inchers with even more sensitivity?

Cheers
Kris
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Old 24th August 2009, 11:30 AM   #2
col is offline col  Australia
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How about the good ole JBL E120? Can still pick them up on Ebay.

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Old 24th August 2009, 01:07 PM   #3
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Hi,

Also
Beyma 12MI100 : http://profesional.beyma.com/pdf/12MI100E.pdf


Hava fun
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Old 24th August 2009, 01:18 PM   #4
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Or Beyma 12P80Nd....
101dB 2.83v @ 1m @ 2pi

http://profesional.beyma.com/ingles/pdf/12P80Nd.pdf
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Old 24th August 2009, 06:20 PM   #5
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The JBL might be interesting - sort of depends on what breakup there is close to x-over frequency and what it is capable of near the 150 cycles area.

The Beymas look mediocre and their sensitivity is closer to 95 db than what they claim.

The 18Sound driver is still top of my list...
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Old 24th August 2009, 06:33 PM   #6
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That 18sound driver looks pretty much like 95 dB @ 150 Hz as well.

It is interesting to calculate the efficiency using the T/S parameters, as this will say a lot about what you will get in real life around 150 Hz, where the speaker is more or less operating in free-field acoustic conditions.

The drivers mentioned have the following sensitivity based on T/S (into 4pi)

18Sound 12NBM420 93,0 dB
Beyma 12MI100 93,2 dB
Beyma 12P80Nd 93,5 dB
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Old 24th August 2009, 06:38 PM   #7
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Eminence Wizard looks smooth over that range. Course if you cross much above 800
you gonna start hearing the MI cone doing its thing... Claim 103dB, but the graph is
101 over the range of interest to you.
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Old 24th August 2009, 06:55 PM   #8
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AE TD12M, 18Sound 12NDA520
http://sites.google.com/site/driverv...band-75-1558se
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Old 24th August 2009, 07:58 PM   #9
ScottG is offline ScottG  United States
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http://www.supravox.fr/anglais/haut_...rs/285_GMF.htm

http://oem.ciare.com/it/297/359/prodotti.php
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Last edited by ScottG; 24th August 2009 at 08:18 PM.
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Old 25th August 2009, 09:21 AM   #10
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Default wide baffle

Quote:
Originally Posted by StigErik View Post
That 18sound driver looks pretty much like 95 dB @ 150 Hz as well.

It is interesting to calculate the efficiency using the T/S parameters, as this will say a lot about what you will get in real life around 150 Hz, where the speaker is more or less operating in free-field acoustic conditions.

The drivers mentioned have the following sensitivity based on T/S (into 4pi)

18Sound 12NBM420 93,0 dB
Beyma 12MI100 93,2 dB
Beyma 12P80Nd 93,5 dB
The driver will be placed in a wide U shaped baffle with very large roundovers and very gradual transfer into 4pi. The 18Sound 12NBM420 is measured in a small enclosure. I expect baffle step to appear below x-over freq. in the set up that I use.

Kris
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